<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>圆角边框
    </title>
</head>
<body>

<style>
    div{
        width: 200px;
        height: 200px;
        border: 10px solid red;
        /*border-top-left-radius: 20px;*/
        /*border-top-right-radius: 10px;*/
        /*border-bottom-right-radius: 50px;*/
        /*border-bottom-left-radius: 30px;*/
        border-radius: 20px 10px 50px 30px;
    }
</style>
<div>

</div>
</body>
</html>